Apparatus and method for wireless communications
View Patent ↗An apparatus including: a first transistor including a first port configured for connection to an antenna having a first impedance at a first frequency band, and a second port configured for connection to radio circuitry, the first port of the first transistor being configured to have an impedance at the first frequency band substantially equal to the complex conjugate of the first impedance.
1. An apparatus comprising:
a first transistor including a first port configured for connection to an antenna having a first impedance at a first frequency band, and a second port configured for connection to radio circuitry, the first port of the first transistor being configured to have an impedance at the first frequency band substantially equal to the complex conjugate of the first impedance.
2. An apparatus as claimed in claim 1 , further comprising biasing circuitry configured to couple in series with the first transistor.
3. An apparatus as claimed in claim 1 , wherein the first transistor is a bipolar junction transistor and the first port is an emitter and the second port is a collector.
4. An apparatus as claimed in claim 1 , wherein the first transistor is a field effect transistor and the first port is a source and the second port is a drain.
5. An apparatus as claimed in claim 1 , wherein the first transistor is a portion of the radio circuitry.
6. An apparatus as claimed in claim 1 , wherein the radio circuitry includes receiver circuitry and/or transmitter circuitry.
7. A portable communication device comprising an apparatus as claimed in claim 1 .
8. An apparatus as claimed in claim 1 , wherein the radio circuitry has a second impedance at the first frequency band, and the second port of the first transistor is configured to have an impedance at the first frequency band substantially equal to the complex conjugate of the second impedance.
9. An apparatus as claimed in claim 8 , wherein the first impedance is lower in impedance than the second impedance.
10. An apparatus as claimed in claim 1 , further comprising the antenna, the antenna being directly connected to the first port of the first transistor.
11. An apparatus as claimed in claim 10 , wherein the antenna is directly connected in series to the first port of the first transistor.
12. An integrated circuit comprising an apparatus as claimed in claim 1 .
13. A portable communication device comprising an integrated circuit as claimed in claim 12 .
14. An apparatus as claimed in claim 1 , further comprising a second transistor including a first port configured for connection to the antenna, and a second port configured for connection to the radio circuitry, the first port of the second transistor being configured to have an impedance at the first frequency band substantially equal to the complex conjugate of the first impedance.
15. An apparatus as claimed in claim 14 , wherein the first transistor, the second transistor and the antenna form a differential amplifier.
16. An apparatus as claimed in claim 14 , wherein the second transistor is a portion of the radio circuitry.
17. An apparatus as claimed in claim 14 , further comprising the antenna, the antenna being directly connected to the first port of the first transistor and to the first port of the second transistor.
18. An apparatus as claimed in claim 17 , wherein the antenna is directly connected in series to the first port of the first transistor and to the first port of the second transistor.
19. A method comprising:
providing a first transistor including a first port configured for connection to an antenna having a first impedance at a first frequency band, and a second port configured for connection to radio circuitry; and
configuring the first port of the first transistor to have an impedance at the first frequency band substantially equal to the complex conjugate of the first impedance.
20. A method as claimed in claim 19 , further comprising providing biasing circuitry configured to couple in series to the first transistor.
21. A method as claimed in claim 19 , wherein the first transistor is a portion of the radio circuitry.
22. A method as claimed in claim 19 , wherein the radio circuitry includes receiver circuitry and/or transmitter circuitry.
23. A method as claimed in claim 19 , wherein the radio circuitry has a second impedance at the first frequency band, and the method further comprises configuring the second port of the first transistor to have an impedance at the first frequency band substantially equal to the complex conjugate of the second impedance.
24. A method as claimed in claim 23 , wherein the first impedance is lower in impedance than the second impedance.
25. A method as claimed in claim 19 , further comprising providing the antenna and directly connecting the antenna to the first port of the first transistor.
26. A method as claimed in claim 25 , wherein the antenna is directly connected in series to the first port of the first transistor.
27. A method apparatus as claimed in claim 19 , further comprising providing a second transistor including a first port configured for connection to the antenna, and a second port configured for connection to the radio circuitry; and configuring the first port of the second transistor to have an impedance at the first frequency band substantially equal to the complex conjugate of the first impedance.
28. A method as claimed in claim 27 , further comprising providing the antenna and directly connecting the antenna to the first port of the first transistor and to the first port of the second transistor.
29. A method as claimed in claim 27 , wherein the first transistor, the second transistor and the antenna form a differential amplifier.
30. A method as claimed in claim 27 , wherein the second transistor is a portion of the radio circuitry.